<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Webpack 在线项目</title>
</head>
<body>
  <div id="app">app</div>
  <!-- bundle.js 会自动注入 -->
</body>                                                                                                             
</html>